114a43e69SBenjamin Herrenschmidt /* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 12c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 1314a43e69SBenjamin Herrenschmidt 14c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1614a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1726a2056eSRob Herring #include <linux/of_fdt.h> 1814a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 198f95faaaSMadhavan Srinivasan #include <linux/of_address.h> 20a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 211bc98de2SGavin Shan #include <linux/notifier.h> 2273ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 23b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 246f68b5e2SVasant Hegde #include <linux/kobject.h> 25f7d98d18SVasant Hegde #include <linux/delay.h> 2655672ecfSMahesh Salgaonkar #include <linux/memblock.h> 273bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 283bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 29b14726c5SMichael Ellerman 30b14726c5SMichael Ellerman #include <asm/machdep.h> 3114a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3214a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3336df96f8SMahesh Salgaonkar #include <asm/mce.h> 348f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 3514a43e69SBenjamin Herrenschmidt 3614a43e69SBenjamin Herrenschmidt #include "powernv.h" 3714a43e69SBenjamin Herrenschmidt 386f68b5e2SVasant Hegde /* /sys/firmware/opal */ 396f68b5e2SVasant Hegde struct kobject *opal_kobj; 406f68b5e2SVasant Hegde 4114a43e69SBenjamin Herrenschmidt struct opal { 4214a43e69SBenjamin Herrenschmidt u64 base; 4314a43e69SBenjamin Herrenschmidt u64 entry; 4455672ecfSMahesh Salgaonkar u64 size; 4514a43e69SBenjamin Herrenschmidt } opal; 4614a43e69SBenjamin Herrenschmidt 4755672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4855672ecfSMahesh Salgaonkar u64 start_addr; 4955672ecfSMahesh Salgaonkar u64 end_addr; 5055672ecfSMahesh Salgaonkar u64 recover_addr; 5155672ecfSMahesh Salgaonkar }; 5255672ecfSMahesh Salgaonkar 5355672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5455672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5555672ecfSMahesh Salgaonkar 56bfc36894SJoel Stanley struct device_node *opal_node; 5714a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5824366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 593bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 60a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 6114a43e69SBenjamin Herrenschmidt 62d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 634926616cSBenjamin Herrenschmidt { 641c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 651c0eaf0fSBenjamin Herrenschmidt 664926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 674926616cSBenjamin Herrenschmidt * 684926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 694926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 704926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 714926616cSBenjamin Herrenschmidt */ 724926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 731c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 744926616cSBenjamin Herrenschmidt #else 751c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 764926616cSBenjamin Herrenschmidt #endif 77d3cbff1bSBenjamin Herrenschmidt 781c0eaf0fSBenjamin Herrenschmidt /* 791c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 801c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 811c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 821c0eaf0fSBenjamin Herrenschmidt */ 83a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 841c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 851c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 861c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 871c0eaf0fSBenjamin Herrenschmidt } 881c0eaf0fSBenjamin Herrenschmidt 891c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 901c0eaf0fSBenjamin Herrenschmidt 91d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 92d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 93d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 944926616cSBenjamin Herrenschmidt } 954926616cSBenjamin Herrenschmidt 9614a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 9714a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 9814a43e69SBenjamin Herrenschmidt { 9955672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1009d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 10114a43e69SBenjamin Herrenschmidt 10214a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10314a43e69SBenjamin Herrenschmidt return 0; 10414a43e69SBenjamin Herrenschmidt 10514a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 10614a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 10755672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 10814a43e69SBenjamin Herrenschmidt 10955672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 11014a43e69SBenjamin Herrenschmidt return 1; 11114a43e69SBenjamin Herrenschmidt 11214a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11314a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11455672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 11514a43e69SBenjamin Herrenschmidt 1169d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 11714a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1189d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 11914a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1209d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 12155672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12214a43e69SBenjamin Herrenschmidt 12375b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 124e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 125e4d54f71SStewart Smith pr_info("OPAL detected !\n"); 12614a43e69SBenjamin Herrenschmidt } else { 127786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 12814a43e69SBenjamin Herrenschmidt } 12914a43e69SBenjamin Herrenschmidt 130c4463b37SJeremy Kerr return 1; 131c4463b37SJeremy Kerr } 132c4463b37SJeremy Kerr 13355672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13455672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13555672ecfSMahesh Salgaonkar { 1369d0c4dfeSRob Herring int i, psize, size; 13755672ecfSMahesh Salgaonkar const __be32 *prop; 13855672ecfSMahesh Salgaonkar 13955672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 14055672ecfSMahesh Salgaonkar return 0; 14155672ecfSMahesh Salgaonkar 1426e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14355672ecfSMahesh Salgaonkar 14455672ecfSMahesh Salgaonkar if (!prop) 14555672ecfSMahesh Salgaonkar return 1; 14655672ecfSMahesh Salgaonkar 14755672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 14855672ecfSMahesh Salgaonkar 14955672ecfSMahesh Salgaonkar /* 1506e556b47SMahesh Salgaonkar * Calculate number of available entries. 1516e556b47SMahesh Salgaonkar * 1526e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1536e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1546e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1556e556b47SMahesh Salgaonkar */ 1566e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1576e556b47SMahesh Salgaonkar 1586e556b47SMahesh Salgaonkar /* Sanity check */ 1596e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1606e556b47SMahesh Salgaonkar return 1; 1616e556b47SMahesh Salgaonkar 1626e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1636e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1646e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1656e556b47SMahesh Salgaonkar 1666e556b47SMahesh Salgaonkar /* 16776b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 16855672ecfSMahesh Salgaonkar */ 16976b42e28SNicholas Piggin mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64))); 17055672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 17155672ecfSMahesh Salgaonkar 1726e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17355672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17455672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17555672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 17655672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 17755672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 17855672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 17955672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18055672ecfSMahesh Salgaonkar 18155672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18355672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18555672ecfSMahesh Salgaonkar } 18655672ecfSMahesh Salgaonkar return 1; 18755672ecfSMahesh Salgaonkar } 18855672ecfSMahesh Salgaonkar 189c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 190c4463b37SJeremy Kerr { 19129186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 192c4463b37SJeremy Kerr u64 glue; 193c4463b37SJeremy Kerr 194c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 195c4463b37SJeremy Kerr return -ENODEV; 196c4463b37SJeremy Kerr 19728446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 19828446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 199ed79ba9eSBenjamin Herrenschmidt */ 200ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2016507955cSMahesh Salgaonkar 2026507955cSMahesh Salgaonkar /* 2036507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2046507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2056507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2066507955cSMahesh Salgaonkar * 2076507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2086507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2096507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2106507955cSMahesh Salgaonkar * 2116507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2126507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2136507955cSMahesh Salgaonkar */ 2146507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 21508135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2166507955cSMahesh Salgaonkar opal_register_exception_handler( 2176507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2186507955cSMahesh Salgaonkar 0, glue); 2196507955cSMahesh Salgaonkar glue += 128; 2206507955cSMahesh Salgaonkar } 2216507955cSMahesh Salgaonkar 222ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22329186097SBenjamin Herrenschmidt #endif 224ed79ba9eSBenjamin Herrenschmidt 225c4463b37SJeremy Kerr return 0; 22614a43e69SBenjamin Herrenschmidt } 227b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 228c4463b37SJeremy Kerr 22924366360SMahesh Salgaonkar /* 23024366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23124366360SMahesh Salgaonkar * notified for specific messgae type. 23224366360SMahesh Salgaonkar */ 233d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 23424366360SMahesh Salgaonkar struct notifier_block *nb) 23524366360SMahesh Salgaonkar { 236792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 237792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 23824366360SMahesh Salgaonkar __func__, msg_type); 23924366360SMahesh Salgaonkar return -EINVAL; 24024366360SMahesh Salgaonkar } 241792f96e9SNeelesh Gupta 24224366360SMahesh Salgaonkar return atomic_notifier_chain_register( 24324366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 24424366360SMahesh Salgaonkar } 245594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 24624366360SMahesh Salgaonkar 247df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 248b921e902SNeelesh Gupta struct notifier_block *nb) 249b921e902SNeelesh Gupta { 250b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 251b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 252b921e902SNeelesh Gupta } 253594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 254b921e902SNeelesh Gupta 25524366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 25624366360SMahesh Salgaonkar { 25724366360SMahesh Salgaonkar /* notify subscribers */ 25824366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 25924366360SMahesh Salgaonkar msg_type, msg); 26024366360SMahesh Salgaonkar } 26124366360SMahesh Salgaonkar 26224366360SMahesh Salgaonkar static void opal_handle_message(void) 26324366360SMahesh Salgaonkar { 26424366360SMahesh Salgaonkar s64 ret; 26524366360SMahesh Salgaonkar /* 26624366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 26724366360SMahesh Salgaonkar * value in /proc/device-tree. 26824366360SMahesh Salgaonkar */ 26924366360SMahesh Salgaonkar static struct opal_msg msg; 270bb4398e1SAnton Blanchard u32 type; 27124366360SMahesh Salgaonkar 27224366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27324366360SMahesh Salgaonkar /* No opal message pending. */ 27424366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 27524366360SMahesh Salgaonkar return; 27624366360SMahesh Salgaonkar 27724366360SMahesh Salgaonkar /* check for errors. */ 27824366360SMahesh Salgaonkar if (ret) { 2791a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 28024366360SMahesh Salgaonkar __func__, ret); 28124366360SMahesh Salgaonkar return; 28224366360SMahesh Salgaonkar } 28324366360SMahesh Salgaonkar 284bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 285bb4398e1SAnton Blanchard 28624366360SMahesh Salgaonkar /* Sanity check */ 287792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 28898da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 28924366360SMahesh Salgaonkar return; 29024366360SMahesh Salgaonkar } 291bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 29224366360SMahesh Salgaonkar } 29324366360SMahesh Salgaonkar 294a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 29524366360SMahesh Salgaonkar { 29624366360SMahesh Salgaonkar opal_handle_message(); 297a295af24SAlistair Popple return IRQ_HANDLED; 29824366360SMahesh Salgaonkar } 29924366360SMahesh Salgaonkar 30024366360SMahesh Salgaonkar static int __init opal_message_init(void) 30124366360SMahesh Salgaonkar { 302a295af24SAlistair Popple int ret, i, irq; 30324366360SMahesh Salgaonkar 30424366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 30524366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 30624366360SMahesh Salgaonkar 307a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 308a295af24SAlistair Popple if (!irq) { 309a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 310a295af24SAlistair Popple __func__, irq); 311a295af24SAlistair Popple return irq; 312a295af24SAlistair Popple } 313a295af24SAlistair Popple 314a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 315a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 31624366360SMahesh Salgaonkar if (ret) { 317a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 31824366360SMahesh Salgaonkar __func__, ret); 31924366360SMahesh Salgaonkar return ret; 32024366360SMahesh Salgaonkar } 321a295af24SAlistair Popple 32224366360SMahesh Salgaonkar return 0; 32324366360SMahesh Salgaonkar } 32424366360SMahesh Salgaonkar 32514a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 32614a43e69SBenjamin Herrenschmidt { 3274f89363bSBenjamin Herrenschmidt s64 rc; 3284f89363bSBenjamin Herrenschmidt __be64 evt, len; 32914a43e69SBenjamin Herrenschmidt 33014a43e69SBenjamin Herrenschmidt if (!opal.entry) 331daea1175SBenjamin Herrenschmidt return -ENODEV; 33214a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3334f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 33414a43e69SBenjamin Herrenschmidt return 0; 3354f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 33614a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 33714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3384f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 33914a43e69SBenjamin Herrenschmidt return 0; 34014a43e69SBenjamin Herrenschmidt } 34114a43e69SBenjamin Herrenschmidt 34214a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 34314a43e69SBenjamin Herrenschmidt { 34414a43e69SBenjamin Herrenschmidt int written = 0; 3454f89363bSBenjamin Herrenschmidt __be64 olen; 346daea1175SBenjamin Herrenschmidt s64 len, rc; 34714a43e69SBenjamin Herrenschmidt unsigned long flags; 3484f89363bSBenjamin Herrenschmidt __be64 evt; 34914a43e69SBenjamin Herrenschmidt 35014a43e69SBenjamin Herrenschmidt if (!opal.entry) 351daea1175SBenjamin Herrenschmidt return -ENODEV; 35214a43e69SBenjamin Herrenschmidt 35314a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 35414a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 355daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 356daea1175SBenjamin Herrenschmidt * 357daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 358daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 359daea1175SBenjamin Herrenschmidt * enough room and be done with it 36014a43e69SBenjamin Herrenschmidt */ 36114a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3624f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3634f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 36414a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 36514a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 36614a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 36714a43e69SBenjamin Herrenschmidt if (rc) 36814a43e69SBenjamin Herrenschmidt return total_len; 3694f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 37014a43e69SBenjamin Herrenschmidt return -EAGAIN; 37114a43e69SBenjamin Herrenschmidt } 37214a43e69SBenjamin Herrenschmidt 37314a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 37414a43e69SBenjamin Herrenschmidt * should no longer happen. 37514a43e69SBenjamin Herrenschmidt */ 376daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 37714a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 37814a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3794f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3804f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3814f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3821de1455fSBenjamin Herrenschmidt 3831de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3841de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3851de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3861de1455fSBenjamin Herrenschmidt written = total_len; 3871de1455fSBenjamin Herrenschmidt break; 3881de1455fSBenjamin Herrenschmidt } 38914a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 39014a43e69SBenjamin Herrenschmidt total_len -= len; 39114a43e69SBenjamin Herrenschmidt data += len; 39214a43e69SBenjamin Herrenschmidt written += len; 39314a43e69SBenjamin Herrenschmidt } 39414a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 39514a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 39614a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 39714a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 39814a43e69SBenjamin Herrenschmidt */ 39914a43e69SBenjamin Herrenschmidt do 40014a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4014f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4024f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 40314a43e69SBenjamin Herrenschmidt } 40414a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 40514a43e69SBenjamin Herrenschmidt return written; 40614a43e69SBenjamin Herrenschmidt } 40714a43e69SBenjamin Herrenschmidt 408b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 409b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 410b63a0ffeSMahesh Salgaonkar { 411b63a0ffeSMahesh Salgaonkar int recovered = 0; 412b63a0ffeSMahesh Salgaonkar 413b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 414b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 415c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 416b63a0ffeSMahesh Salgaonkar recovered = 0; 417b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 418b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 419b63a0ffeSMahesh Salgaonkar recovered = 1; 4201363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 4211363875bSNicholas Piggin /* Fatal machine check */ 4221363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 4231363875bSNicholas Piggin recovered = 0; 4241363875bSNicholas Piggin } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && 4251363875bSNicholas Piggin (user_mode(regs) && !is_global_init(current))) { 426b63a0ffeSMahesh Salgaonkar /* 427b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 428b63a0ffeSMahesh Salgaonkar * in userspace. 429b63a0ffeSMahesh Salgaonkar * 430b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 431b63a0ffeSMahesh Salgaonkar */ 432b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 433b63a0ffeSMahesh Salgaonkar recovered = 1; 434b63a0ffeSMahesh Salgaonkar } 435b63a0ffeSMahesh Salgaonkar return recovered; 436b63a0ffeSMahesh Salgaonkar } 437b63a0ffeSMahesh Salgaonkar 438ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 439ed79ba9eSBenjamin Herrenschmidt { 44036df96f8SMahesh Salgaonkar struct machine_check_event evt; 441e784b649SMahesh Salgaonkar int ret; 442ed79ba9eSBenjamin Herrenschmidt 44336df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 44436df96f8SMahesh Salgaonkar return 0; 445ed79ba9eSBenjamin Herrenschmidt 446ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 44736df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 448ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 449ed79ba9eSBenjamin Herrenschmidt evt.version); 450ed79ba9eSBenjamin Herrenschmidt return 0; 451ed79ba9eSBenjamin Herrenschmidt } 45263f44d65SMichael Ellerman machine_check_print_event_info(&evt, user_mode(regs)); 453ed79ba9eSBenjamin Herrenschmidt 454b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 455b63a0ffeSMahesh Salgaonkar return 1; 456e784b649SMahesh Salgaonkar 457e784b649SMahesh Salgaonkar /* 458e784b649SMahesh Salgaonkar * Unrecovered machine check, we are heading to panic path. 459e784b649SMahesh Salgaonkar * 460e784b649SMahesh Salgaonkar * We may have hit this MCE in very early stage of kernel 461e784b649SMahesh Salgaonkar * initialization even before opal-prd has started running. If 462e784b649SMahesh Salgaonkar * this is the case then this MCE error may go un-noticed or 463e784b649SMahesh Salgaonkar * un-analyzed if we go down panic path. We need to inform 464e784b649SMahesh Salgaonkar * BMC/OCC about this error so that they can collect relevant 465e784b649SMahesh Salgaonkar * data for error analysis before rebooting. 466e784b649SMahesh Salgaonkar * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 467e784b649SMahesh Salgaonkar * This function may not return on BMC based system. 468e784b649SMahesh Salgaonkar */ 469e784b649SMahesh Salgaonkar ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 470e784b649SMahesh Salgaonkar "Unrecoverable Machine Check exception"); 471e784b649SMahesh Salgaonkar if (ret == OPAL_UNSUPPORTED) { 472e784b649SMahesh Salgaonkar pr_emerg("Reboot type %d not supported\n", 473e784b649SMahesh Salgaonkar OPAL_REBOOT_PLATFORM_ERROR); 474e784b649SMahesh Salgaonkar } 475e784b649SMahesh Salgaonkar 476e784b649SMahesh Salgaonkar /* 477e784b649SMahesh Salgaonkar * We reached here. There can be three possibilities: 478e784b649SMahesh Salgaonkar * 1. We are running on a firmware level that do not support 479e784b649SMahesh Salgaonkar * opal_cec_reboot2() 480e784b649SMahesh Salgaonkar * 2. We are running on a firmware level that do not support 481e784b649SMahesh Salgaonkar * OPAL_REBOOT_PLATFORM_ERROR reboot type. 482e784b649SMahesh Salgaonkar * 3. We are running on FSP based system that does not need opal 483e784b649SMahesh Salgaonkar * to trigger checkstop explicitly for error analysis. The FSP 484e784b649SMahesh Salgaonkar * PRD component would have already got notified about this 485e784b649SMahesh Salgaonkar * error through other channels. 486e784b649SMahesh Salgaonkar * 487f2dd80ecSDaniel Axtens * If hardware marked this as an unrecoverable MCE, we are 488f2dd80ecSDaniel Axtens * going to panic anyway. Even if it didn't, it's not safe to 489f2dd80ecSDaniel Axtens * continue at this point, so we should explicitly panic. 490e784b649SMahesh Salgaonkar */ 491f2dd80ecSDaniel Axtens 492f2dd80ecSDaniel Axtens panic("PowerNV Unrecovered Machine Check"); 493b63a0ffeSMahesh Salgaonkar return 0; 494ed79ba9eSBenjamin Herrenschmidt } 495ed79ba9eSBenjamin Herrenschmidt 4960869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 4970869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 4980869b6fdSMahesh Salgaonkar { 4990ef95b41SMahesh Salgaonkar s64 rc; 5000ef95b41SMahesh Salgaonkar 5010ef95b41SMahesh Salgaonkar /* 5020ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5030ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5040ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5050ef95b41SMahesh Salgaonkar */ 5060ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5070ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5080ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5090ef95b41SMahesh Salgaonkar return 1; 5100ef95b41SMahesh Salgaonkar } 5110869b6fdSMahesh Salgaonkar return 0; 5120869b6fdSMahesh Salgaonkar } 5130869b6fdSMahesh Salgaonkar 5140869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5150869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5160869b6fdSMahesh Salgaonkar { 5170ef95b41SMahesh Salgaonkar s64 rc; 5180ef95b41SMahesh Salgaonkar __be64 evt = 0; 5190ef95b41SMahesh Salgaonkar 5200ef95b41SMahesh Salgaonkar /* 5210ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5220ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5230ef95b41SMahesh Salgaonkar * process them. 5240ef95b41SMahesh Salgaonkar */ 5250ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5260869b6fdSMahesh Salgaonkar return 0; 5270ef95b41SMahesh Salgaonkar 5280ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5290ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 53081f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5319f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5320ef95b41SMahesh Salgaonkar 5330ef95b41SMahesh Salgaonkar return 1; 5340869b6fdSMahesh Salgaonkar } 5350869b6fdSMahesh Salgaonkar 53655672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 53755672ecfSMahesh Salgaonkar { 53855672ecfSMahesh Salgaonkar int i; 53955672ecfSMahesh Salgaonkar 54055672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 54155672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 54255672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 54355672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 54455672ecfSMahesh Salgaonkar return 0; 54555672ecfSMahesh Salgaonkar } 54655672ecfSMahesh Salgaonkar 54755672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 54855672ecfSMahesh Salgaonkar { 54955672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 55055672ecfSMahesh Salgaonkar 55155672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 55255672ecfSMahesh Salgaonkar goto out; 55355672ecfSMahesh Salgaonkar 55455672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 555dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 55655672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 55755672ecfSMahesh Salgaonkar 55855672ecfSMahesh Salgaonkar /* 55955672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 56055672ecfSMahesh Salgaonkar */ 56155672ecfSMahesh Salgaonkar if (recover_addr) 56255672ecfSMahesh Salgaonkar regs->nip = recover_addr; 56355672ecfSMahesh Salgaonkar 56455672ecfSMahesh Salgaonkar out: 56555672ecfSMahesh Salgaonkar return !!recover_addr; 56655672ecfSMahesh Salgaonkar } 56755672ecfSMahesh Salgaonkar 5686f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5696f68b5e2SVasant Hegde { 5706f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5716f68b5e2SVasant Hegde if (!opal_kobj) { 5726f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5736f68b5e2SVasant Hegde return -ENOMEM; 5746f68b5e2SVasant Hegde } 5756f68b5e2SVasant Hegde 5766f68b5e2SVasant Hegde return 0; 5776f68b5e2SVasant Hegde } 5786f68b5e2SVasant Hegde 579c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 580c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 581c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 582c8742f85SBenjamin Herrenschmidt { 583c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 584c8742f85SBenjamin Herrenschmidt bin_attr->size); 585c8742f85SBenjamin Herrenschmidt } 586c8742f85SBenjamin Herrenschmidt 587c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 588c8742f85SBenjamin Herrenschmidt 589c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 590c8742f85SBenjamin Herrenschmidt { 591c8742f85SBenjamin Herrenschmidt const __be64 *syms; 592c8742f85SBenjamin Herrenschmidt unsigned int size; 593c8742f85SBenjamin Herrenschmidt struct device_node *fw; 594c8742f85SBenjamin Herrenschmidt int rc; 595c8742f85SBenjamin Herrenschmidt 596c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 597c8742f85SBenjamin Herrenschmidt if (!fw) 598c8742f85SBenjamin Herrenschmidt return; 599c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 600c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 601c8742f85SBenjamin Herrenschmidt return; 602c8742f85SBenjamin Herrenschmidt 603c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 604c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 605c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 606c8742f85SBenjamin Herrenschmidt 607c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 608c8742f85SBenjamin Herrenschmidt if (rc) 609c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 610c8742f85SBenjamin Herrenschmidt } 611c8742f85SBenjamin Herrenschmidt 61211fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 61311fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 61411fe909dSMatt Brown loff_t off, size_t count) 61511fe909dSMatt Brown { 61611fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 61711fe909dSMatt Brown bin_attr->size); 61811fe909dSMatt Brown } 61911fe909dSMatt Brown 62011fe909dSMatt Brown /* 62111fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 62211fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 62311fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 62411fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 62511fe909dSMatt Brown * The new sysfs nodes are only readable by root. 62611fe909dSMatt Brown */ 62711fe909dSMatt Brown static void opal_export_attrs(void) 62811fe909dSMatt Brown { 62911fe909dSMatt Brown struct bin_attribute *attr; 63011fe909dSMatt Brown struct device_node *np; 63111fe909dSMatt Brown struct property *prop; 63211fe909dSMatt Brown struct kobject *kobj; 63311fe909dSMatt Brown u64 vals[2]; 63411fe909dSMatt Brown int rc; 63511fe909dSMatt Brown 63611fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 63711fe909dSMatt Brown if (!np) 63811fe909dSMatt Brown return; 63911fe909dSMatt Brown 64011fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 64111fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 64211fe909dSMatt Brown if (!kobj) { 64311fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 64411fe909dSMatt Brown return; 64511fe909dSMatt Brown } 64611fe909dSMatt Brown 64711fe909dSMatt Brown for_each_property_of_node(np, prop) { 64811fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 64911fe909dSMatt Brown continue; 65011fe909dSMatt Brown 65111fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 65211fe909dSMatt Brown continue; 65311fe909dSMatt Brown 65483c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 65511fe909dSMatt Brown 65611fe909dSMatt Brown if (attr == NULL) { 65711fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 65811fe909dSMatt Brown continue; 65911fe909dSMatt Brown } 66011fe909dSMatt Brown 66183c49190SMichael Ellerman sysfs_bin_attr_init(attr); 66211fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 66311fe909dSMatt Brown attr->attr.mode = 0400; 66411fe909dSMatt Brown attr->read = export_attr_read; 66511fe909dSMatt Brown attr->private = __va(vals[0]); 66611fe909dSMatt Brown attr->size = vals[1]; 66711fe909dSMatt Brown 66811fe909dSMatt Brown if (attr->attr.name == NULL) { 66911fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 67011fe909dSMatt Brown kfree(attr); 67111fe909dSMatt Brown continue; 67211fe909dSMatt Brown } 67311fe909dSMatt Brown 67411fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 67511fe909dSMatt Brown if (rc) { 67611fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 67711fe909dSMatt Brown rc, prop->name); 67811fe909dSMatt Brown kfree(attr->attr.name); 67911fe909dSMatt Brown kfree(attr); 68011fe909dSMatt Brown } 68111fe909dSMatt Brown } 68211fe909dSMatt Brown 68311fe909dSMatt Brown of_node_put(np); 68411fe909dSMatt Brown } 68511fe909dSMatt Brown 686b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 687b09c2ec4SVasant Hegde { 688b09c2ec4SVasant Hegde void *addr; 689b09c2ec4SVasant Hegde uint64_t size; 690b09c2ec4SVasant Hegde int rc; 691b09c2ec4SVasant Hegde 692b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 693b962f5a4SStewart Smith return; 694b962f5a4SStewart Smith 695b09c2ec4SVasant Hegde /* Register kernel log buffer */ 696b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6976501ab5eSPranith Kumar if (addr == NULL) 6986501ab5eSPranith Kumar return; 6996501ab5eSPranith Kumar 700b09c2ec4SVasant Hegde size = log_buf_len_get(); 7016501ab5eSPranith Kumar if (size == 0) 7026501ab5eSPranith Kumar return; 7036501ab5eSPranith Kumar 704b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 705b09c2ec4SVasant Hegde __pa(addr), size); 706b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 707b09c2ec4SVasant Hegde * know about that call 708b09c2ec4SVasant Hegde */ 709b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 710b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 711b09c2ec4SVasant Hegde "rc = %d\n", rc); 712b09c2ec4SVasant Hegde } 713608b286dSJeremy Kerr 7149e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 715ed59190eSCyril Bur { 716ed59190eSCyril Bur struct device_node *np; 717ed59190eSCyril Bur 7189e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 71947083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 72047083450SNeelesh Gupta } 72147083450SNeelesh Gupta 7228f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 7238f95faaaSMadhavan Srinivasan { 7248f95faaaSMadhavan Srinivasan struct device_node *np; 7258f95faaaSMadhavan Srinivasan 7268f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 7278f95faaaSMadhavan Srinivasan if (np) 7288f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 7298f95faaaSMadhavan Srinivasan } 7308f95faaaSMadhavan Srinivasan 7313bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7323bf57561SBenjamin Herrenschmidt { 733a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 7349f0fd049SAlistair Popple __be64 events; 7359f0fd049SAlistair Popple 7363bf57561SBenjamin Herrenschmidt set_freezable(); 7373bf57561SBenjamin Herrenschmidt do { 7383bf57561SBenjamin Herrenschmidt try_to_freeze(); 7399f0fd049SAlistair Popple opal_poll_events(&events); 7409f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 741a203658bSBenjamin Herrenschmidt schedule_timeout_interruptible(timeout); 7423bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7433bf57561SBenjamin Herrenschmidt 7443bf57561SBenjamin Herrenschmidt return 0; 7453bf57561SBenjamin Herrenschmidt } 7463bf57561SBenjamin Herrenschmidt 747a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 748a203658bSBenjamin Herrenschmidt { 749a203658bSBenjamin Herrenschmidt if (kopald_tsk) 750a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 751a203658bSBenjamin Herrenschmidt } 752a203658bSBenjamin Herrenschmidt 7533bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7543bf57561SBenjamin Herrenschmidt { 7553bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7563bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7573bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7583bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7593bf57561SBenjamin Herrenschmidt 7603bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 761a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 7623bf57561SBenjamin Herrenschmidt } 7633bf57561SBenjamin Herrenschmidt 76414a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 76514a43e69SBenjamin Herrenschmidt { 766c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 767c1c3a526SGavin Shan int rc; 76814a43e69SBenjamin Herrenschmidt 76914a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 77014a43e69SBenjamin Herrenschmidt if (!opal_node) { 77108135139SMichael Ellerman pr_warn("Device node not found\n"); 77214a43e69SBenjamin Herrenschmidt return -ENODEV; 77314a43e69SBenjamin Herrenschmidt } 7742db29d28SBenjamin Herrenschmidt 7752db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 77614a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 7772db29d28SBenjamin Herrenschmidt if (consoles) { 77814a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 77914a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 78014a43e69SBenjamin Herrenschmidt continue; 78114a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 78214a43e69SBenjamin Herrenschmidt } 78314a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7842db29d28SBenjamin Herrenschmidt } 785a125e092SBenjamin Herrenschmidt 78696e023e7SAlistair Popple /* Initialise OPAL messaging system */ 78796e023e7SAlistair Popple opal_message_init(); 78896e023e7SAlistair Popple 78996e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 79096e023e7SAlistair Popple opal_async_comp_init(); 79196e023e7SAlistair Popple 79296e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 79396e023e7SAlistair Popple opal_sensor_init(); 79496e023e7SAlistair Popple 79596e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 79696e023e7SAlistair Popple opal_hmi_handler_init(); 79796e023e7SAlistair Popple 79847083450SNeelesh Gupta /* Create i2c platform devices */ 7999e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 80047083450SNeelesh Gupta 8013bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 8023bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 8033bf57561SBenjamin Herrenschmidt 8048f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 8058f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 8068f95faaaSMadhavan Srinivasan 807c159b596SVasant Hegde /* Create leds platform devices */ 808c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 809c159b596SVasant Hegde if (leds) { 810c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 811c159b596SVasant Hegde of_node_put(leds); 812c159b596SVasant Hegde } 813c159b596SVasant Hegde 8149b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 8159b4fffa1SAndrew Donnellan opal_msglog_init(); 8169b4fffa1SAndrew Donnellan 8176f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 8186f68b5e2SVasant Hegde rc = opal_sysfs_init(); 81950bd6153SVasant Hegde if (rc == 0) { 820c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 821c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 822b09c2ec4SVasant Hegde /* Setup dump region interface */ 823b09c2ec4SVasant Hegde opal_dump_region_init(); 824774fea1aSStewart Smith /* Setup error log interface */ 825774fea1aSStewart Smith rc = opal_elog_init(); 82650bd6153SVasant Hegde /* Setup code update interface */ 827ed59190eSCyril Bur opal_flash_update_init(); 828c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 829c7e64b9cSStewart Smith opal_platform_dump_init(); 8304029cd66SNeelesh Gupta /* Setup system parameters interface */ 8314029cd66SNeelesh Gupta opal_sys_param_init(); 8329b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 8339b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 83450bd6153SVasant Hegde } 8356f68b5e2SVasant Hegde 83611fe909dSMatt Brown /* Export all properties */ 83711fe909dSMatt Brown opal_export_attrs(); 83811fe909dSMatt Brown 8390d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 8409e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 8419e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 8429e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 843ed59190eSCyril Bur 84443a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 8459e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 84643a1dd9bSSuraj Jitindar Singh 847affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 848affddff6SRussell Currey opal_kmsg_init(); 849affddff6SRussell Currey 850cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 851cb8b340dSShilpasri G Bhat opal_powercap_init(); 852cb8b340dSShilpasri G Bhat 8538e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 8548e84b2d1SShilpasri G Bhat opal_psr_init(); 8558e84b2d1SShilpasri G Bhat 856bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 857bf957155SShilpasri G Bhat opal_sensor_groups_init(); 858bf957155SShilpasri G Bhat 85914a43e69SBenjamin Herrenschmidt return 0; 86014a43e69SBenjamin Herrenschmidt } 861b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 86273ed148aSBenjamin Herrenschmidt 86373ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 86473ed148aSBenjamin Herrenschmidt { 865f7d98d18SVasant Hegde long rc = OPAL_BUSY; 86673ed148aSBenjamin Herrenschmidt 8679f0fd049SAlistair Popple opal_event_shutdown(); 868f7d98d18SVasant Hegde 869f7d98d18SVasant Hegde /* 870f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 871f7d98d18SVasant Hegde * potentially write to our memory has completed such 872f7d98d18SVasant Hegde * as an ongoing dump retrieval 873f7d98d18SVasant Hegde */ 874f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 875f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 876f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 877f7d98d18SVasant Hegde opal_poll_events(NULL); 878f7d98d18SVasant Hegde else 879f7d98d18SVasant Hegde mdelay(10); 880f7d98d18SVasant Hegde } 881b09c2ec4SVasant Hegde 882b09c2ec4SVasant Hegde /* Unregister memory dump region */ 883b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 884b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 88573ed148aSBenjamin Herrenschmidt } 886e28b05e7SJoel Stanley 887e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 888e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 889594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 890594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 891608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 892608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 893ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 894ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 895ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 8960d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 8973441f04bSAnton Blanchard 8983441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 8993441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 9003441f04bSAnton Blanchard unsigned long vmalloc_size) 9013441f04bSAnton Blanchard { 9023441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 9033441f04bSAnton Blanchard unsigned long i = 0; 9043441f04bSAnton Blanchard 9053441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 9063441f04bSAnton Blanchard if (!sg) 9073441f04bSAnton Blanchard goto nomem; 9083441f04bSAnton Blanchard 9093441f04bSAnton Blanchard first = sg; 9103441f04bSAnton Blanchard 9113441f04bSAnton Blanchard while (vmalloc_size > 0) { 9123441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 9133441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 9143441f04bSAnton Blanchard 9153441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 9163441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 9173441f04bSAnton Blanchard i++; 9183441f04bSAnton Blanchard 9193441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 9203441f04bSAnton Blanchard struct opal_sg_list *next; 9213441f04bSAnton Blanchard 9223441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 9233441f04bSAnton Blanchard if (!next) 9243441f04bSAnton Blanchard goto nomem; 9253441f04bSAnton Blanchard 9263441f04bSAnton Blanchard sg->length = cpu_to_be64( 9273441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 9283441f04bSAnton Blanchard i = 0; 9293441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 9303441f04bSAnton Blanchard sg = next; 9313441f04bSAnton Blanchard } 9323441f04bSAnton Blanchard 9333441f04bSAnton Blanchard vmalloc_addr += length; 9343441f04bSAnton Blanchard vmalloc_size -= length; 9353441f04bSAnton Blanchard } 9363441f04bSAnton Blanchard 9373441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9383441f04bSAnton Blanchard 9393441f04bSAnton Blanchard return first; 9403441f04bSAnton Blanchard 9413441f04bSAnton Blanchard nomem: 9423441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9433441f04bSAnton Blanchard opal_free_sg_list(first); 9443441f04bSAnton Blanchard return NULL; 9453441f04bSAnton Blanchard } 9463441f04bSAnton Blanchard 9473441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9483441f04bSAnton Blanchard { 9493441f04bSAnton Blanchard while (sg) { 9503441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9513441f04bSAnton Blanchard 9523441f04bSAnton Blanchard kfree(sg); 9533441f04bSAnton Blanchard 9543441f04bSAnton Blanchard if (next) 9553441f04bSAnton Blanchard sg = __va(next); 9563441f04bSAnton Blanchard else 9573441f04bSAnton Blanchard sg = NULL; 9583441f04bSAnton Blanchard } 9593441f04bSAnton Blanchard } 96016b1d26eSNeelesh Gupta 961e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 962e3c5c2e0SCédric Le Goater { 963e3c5c2e0SCédric Le Goater switch (rc) { 964e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 965e3c5c2e0SCédric Le Goater 966e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 967e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 968e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 969e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 97014aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 971e3c5c2e0SCédric Le Goater 972e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 973e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 974e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 975cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 976e3c5c2e0SCédric Le Goater default: 977e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 978e3c5c2e0SCédric Le Goater return -EIO; 979e3c5c2e0SCédric Le Goater } 980e3c5c2e0SCédric Le Goater } 981e3c5c2e0SCédric Le Goater 9821d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 9831d0761d2SAlistair Popple { 9841d0761d2SAlistair Popple int rc; 9851d0761d2SAlistair Popple 9861d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 9871d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 9881d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 9891d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 9901d0761d2SAlistair Popple } 9911d0761d2SAlistair Popple } 9921d0761d2SAlistair Popple 99316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 99416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 99516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 99616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 99716b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 99847083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 999c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1000c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1001c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 100243a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 100343a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1004ffe6d810SPaul Mackerras /* Export this for KVM */ 1005ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 10065af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 1007